yihui/knitr — pull request #635 by krlmlr (2013-10-24 08:46:12+00:00)
Title: Math mode should be always enabled for inline numbers in LaTeX

Reasons:

- Negative numbers get a proper "minus" sign (not a dash)
- Old-style figures can be enabled for a document, but usually aren't for math
mode (cf. texdoc newtxdoc)
- Special characters such as \infty (cf. #629)